Precision grinder for tools and the like



. 1946- I E. c. SHUGARS 2,392,780 1 PRECISION GRINDER FOR TOOLS AND THE LIKE Filed NOV. 5, 1943 IN VEN TOR.

"6i MWZ [Ia/WEE 6T 6506,9165 Q Patented Jan. 8, 1946 UNIT ED PAT or 2,392,78ih

PREGISIONGRINDERFOR TOGISS AishmE LIKn:

Elmer. G.=.Shugars, Muskegpn Micli.

Application'November'5, 1913i SeriitP N'm 5093034" 6.-(-1laims=-. (cr sis-21s).

This invention relates to improvements in precisiongrinders for tools andithe like.

The: main objects. of this invention are:

First; to provide a precision grinder for tools andithetlike by, means Of. which. inexperienced'op. erators m'ay' efiectively andv rapidly precision rinditoolst.

Secondito provide a; machine of this: type. in. which the wheel dressing tool or' diamond canhe. adjusted to. serve. as a gauge to regulate the grin'ding'ofithe tool:

Third, to' provides structure? in which. a pluralit'y oft'ools may. he successfully round. with accuracy without readjusting'other than. the, generalimanipulation of the grinder.

Fourth',,to. provide a structure having'these ad"- vantages which is simple and; rugged" and with.- stands'severeusage; a

Objects relating to. details; and. economies. of" the. invention will appear. from. the description. to follow. The invention. is defi'nedland. pointed? outinxthecl'aiins.

A preferred embodiment. ofthe. invention. is :il lust'ratedin .the accompanyingflrawing,,in which:

Fig. liisa fragmentary plan viewof'ia structure, embodying. the features of m invention, certain. of the parts being. shOWn;cnVentibnal1y..

Fig: IA" is a fragmentary planiview of a structure embodying the. features of my. invention parts being shown conventionally and only such. portions of. a grindingmachine being illustrated or indicated as are deemedlnecessary, fbr an..un.- derst'anding of'my invention.

Fig. 2 is a side elevational view of the. tool.

holder andillustrati'ng the wheelid'ressing. die..-v

mond'andi precision gauge member in,its.re1ation1 tojthe tool a Fig. 3 is a front perspective view of the. tool. holder" Fig, 4'is a partial planview. illustratinga pre.-- liininary step in the grindingthe clearance for the diamonibeing exaggeratedl.

Fig, 5 is a. fragmentary, plan view similar to? tool. holder. has. been. adjusted? to. the; desired? height relative tb the. grinding wheelgany numher of tools may, he. ground with. precision. without further adjustment other than the fittlhg of the After. the. initial 1 insure clearance.

tool tothe grinding; wheeli During the prelimiiiary grinding of the tojolj the dressing diamond remains out of" contact with the grinding wheel hutihthefihalor fi'nishgri'nding, of the' -toolj the wheel dressing, diamond dressesthe -wheel or cuts away the whee'h thereby preventing an further grinding of the t'ool: If the tool were continu ous1y-reciprocated acrossthe' grinding wheel the only result would he the dressing down* of thegrinding wheel Without further grinding on the tool. It willtbe understood that if the diamond is set hya gaugefor' thedesired cut; allofthe tools ground with this setting will he identical! The grinding of tools with this device greatly fa cilitates the" settingup of-'a plurality of tools on amultiple" 1-athe;,,such for example asmsed" for turning crankshaftseamshafts; and'the like;

In; the accompanying" drawing; t he' reciprocat ing carriage I of' a: grimieris' illustrated mainlyin conventional" form, the carriage heing'provid'ed with a' universal angle vise. 22'? These parts'are shown mainlyfin" conventional fbrm and in their relation. to the: grinding; wheel I95 My improved to'ollholder 2 is mountediorrtheangle vise.

On this carriage I" mount; my improved" t'ool'j holder [this being: adapted tube received by'th'e universall'angle vise not illustrated which isalso' well understood by those in-the artl.

The toolholder. andigrinding gauge-eithe embodiment illustrated comprises the. base or body. portion. 3" and an, upwardly, projecting portion 41 having; aatool' bit side rest portion 5;.the' upper edge ofwhich is outwardl beveled; or. inclined to' 'Ilhetool. 6? is placed'jn. the seat T provided therefnr. andi'securely, clamped'or retainedJtherein. by. meanstofltheithumb setlscrews, 8; one. of these engaging, thesside. oiltl'ie t'ooli andithe. other the top ottheetoolclampingjtto-its..seatl The tool side rest '5 is notched or recessedi'at' 9- to.- accommodate tools. of difierent. shapes... The frontvt'ooli rest. Ill. is-cl'ampedto. theside rest Sby meansoi'thescrew l l-. Thesemests are positioned;

g tdfirmly support-.the. endmof t'he tcolias itis' sub-Q jectedito. the. grinding wheellandthe tool project's. somewhat. ahoveflthe upper facespo fthese' memhersso that'the t'ool'may be ground.

Thev tool holderis provided" with" a forwardlyprojecting portion l2 havin g" an: inclined: face". l3jand. provided with a' bore 14; adapted to receivethe' stem; lfilcf the diamond. support or post 1'6"." post is secured" in" its adjustedpcsiticnsr' by means'of the clamping"screw IF. The-diamond? is -indicated' at 1'8. A

In operation, .thetb'ol' fitissecurel'y mounted in entis: I e I V w a 1.- In a grinder, the combination with a cupped, grinding wheel havingan annular grinding face.

riage I of the grinding machine. The universal the tool holder 2, which is mounted on the carangle vise '22 provides adjustment for properly 7 presenting the tool to the grinding wheel. The angular position of the tool holder provides the necessary clearance and shape of the tool. The diamond point I8 is then adjusted to the desired height by a precision gauge. With the tool holder 'set up; the carriage is vertically, adjusted tothe grindingwheel I Son a line horizontal to the axis of the grinding, wheel. With the carriage in this position, it'now reciprocates horizontally back and forth across the face of the grinding wheel, as shown in Fig.4." It will be noted that the diamond point l8 does not contact the grind-'- ing wheel during the preliminary grinding of the tool,-but when the tool has been ground to the ,full dimension the diamondpoint"dresses the wheel, and with any further reciprocation of the carriage the grinding wheel does not affect the tool; as the grinding wheel continues to be dressed off by the diamond point. Without any change in adjustment of the diamond point any number of tools can be sharpened with the same degree of accuracy and precision.

I have not illustrated various adaptations and V embodimentsoi my invention to different types 7 of grinders-and grinding wheels as it is believed that this disclosure will enable those skilled in the art to embody or adapt my invention as may be desired Having thus described my invention, .what I claim as new and'desireto secure by Letters Patat right angles to the axis of rotation'of the wheel; of a tool holder mountedto reciprocate in 'a path parallel to the plane of the grinding face of said grinding wheel, said tool holder being providedwith atool seat having a tool positioning rest at the front end thereof, means for clamping a tool on said seat with its front end in supported engagement with said tool rest, and an adjustable diamond supporting post mounted on said tool holder in advance of said tool positioning rest for adjustment laterally of the plane of'the face of the grinding wheel so "that .on the work stroke of the tool holder a diamond carried by the post is'moved in a line parallel to the plane of the ing face thereof in advance of the tool mounted on the'tool holder, the range ,of adjustment of said post relative to the plane of the face of the grinding ,wheelbeing such as to provide'adjustment ,to a position in which substantially finishedg'rinding of the tool results prior to the diamond being brought into dressing engagement constitutesa' gauge for limiting the grinding of V V the tool.

grinding face thereof in advance of the tool mounted on the tool holder, the range of adjustment of said post relative to theplane of the face of the grinding wheel being such as to provide adjustment to a position in which substantially finished grinding of the tool results prior to the diamond being brought into dressing engagement with the grinding wheel whereby the diamond constitutes a gauge for limiting the grinding ofthe tool. f

3; In a grinder-, the combination with a grinding wheel having a grinding face disposed at right angles to theaxis of rotation of the wheel, of a 7 tool holder mounted for reciprocation in a plane parallel to the plane of the face of the grinding wheel, and a diamond support mounted on the tool holder in advance of the tool support thereof so that on the work stroke of the tool holder a diamond carried by the diamond support is moved in a line parallel to the face of the grinding wheel and across the face of the grinding wheel in advance of the tool, 'said' diamond support being adjustablerelative to the plane of the face of the grinding wheel to a position in which the diamond is out of engagement with said grinding face at thebeginning of the grinding of the tool and to a position in which the diamond constitutes a gauge for limiting thegrinding of the worn the completion of the grinding of the tool. V

4. In a'grinder, theco-mbination with a grinding Wheel having a grinding face disposed at right angles to the axis of rotation of the Wheel, of a tool holder reciprocable in a plane parallel torthe plane of the face of the grinding wheel,

and a diamond'support mountedonsaid tool holder in advance of the tool mounted thereon advance of the tool, said diamond support being adjustable on said tool holder relative to the and so that on the work stroke of the tool holder a diamond carried by. the diamond support is moved across the face of the grinding wheel in plane of,reciprocationthereof and relative 'to the tool thereon to 'a position in which the diamond is outrof engagement with the grinding face at the beginning of the grinding of the tool by said ,60 face of the grinding wheel and across the 'grindgrinding face and to a position in which it will dress the grinding wheel to such an extent as to constitute a gauge for limiting the grinding of the tool at the completion of the grinding of the tool. V 5. In 'a grinder,

7 ing wheel, of a tool holder reoiprocable in a plane parallel to the grinding face of the grinding wheel, and a wheel dressing diamond mounted on said tool holder in advance of the tool carried thereby so that on the work stroke of the tool 7 holder the'diamond is moved across the face of with the grindingwheel whereby thediamond 2. In a grinder, the combination with a grinding wheel having a grinding face at right angles to-theolaxis of rotation of the wheel, of a tool holder mounted to reciprocate in a path parallel tothe plane of the grinding face of said grinding port is moved in a line parallel to the plane' ofthe faceof the; grinding wheel andlacross the the grinding wheel in advance of the tool on said tool holder, said diamond being positioned relative to the tool and said grinding face to be out of engagement with saidgrinding .face at the beginning of the grinding of the tool and to be broughtinto dressing engagement with the grind--.

ing wheel at the completion of the grindingtof the tool to constitute a gauge for limiting'the grinding of the tool, said diamond being-recip rocatedacross the grinding face of thewheel on each work stroke of thetoolholder V ,6. .In a grinder, the combination with a grinding wheeLof a tool holder reciprocable across the grinding face'of the grinding wheelgandawhel dressing diamond mounted for reciprocationwith said tool holder and in advance of'the tool car ried thereby so that onthe work stroke of the the combination with a grindgrinding wheel only at the completion of the grinding of the tool and to constitute a gauge for limiting the grinding of the tool, said diamond being reoiprocated across the grinding face of 5 the wheel on each work stroke of the tool holder.

ELMER C. SHUGARS. 

